Add support for audio input mute detection on all platforms

media/audio/audio_input_controller.cc

Index: media/audio/audio_input_controller.cc
diff --git a/media/audio/audio_input_controller.cc b/media/audio/audio_input_controller.cc
index 72239f0d9c30efbdc80290988e787cee57e1b531..27741c9440690a558a46ccd632f21f3f80e97eb4 100644
--- a/media/audio/audio_input_controller.cc
+++ b/media/audio/audio_input_controller.cc
@@ -599,6 +599,8 @@ void AudioInputController::DoLogAudioLevels(float level_dbfs,
     log_string += " <=> low microphone level!";
   handler_->OnLog(this, log_string);
 
+  DVLOG(1) << "IsMuted: " << stream_->IsMuted();
+
   // Try to detect if the user has enabled hardware mute by pressing the mute
   // button in audio settings for the selected microphone. The idea here is to
   // detect when all input samples are zeros but the actual volume slider is